植物生长对气候变化的反应:利用树环和卫星数据对生物记忆和时间滞后进行跨度分析
Wenxi Tang1,2,3,4, Shuguang Liu1, Mengdan Jing5
1School of Ecology, Hainan University, Haikou, China.
Global change biology
|July 26, 2024
概括
植被增长转移 (VGC) 显著影响树木生长,往往比气候更重要. 这项研究揭示了VGC和树环上的滞后气候效应 (LCE) 与光合作用脱,突出了VGC.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 林业林业 林业 林业 林业
背景情况:
- 植被生长受到历史生长率和气候变化的影响.
- 树干辐射增长,植被增长转移 (VGC;生物) 和滞后气候效应 (LCE;非生物) 之间的关系可能与光合作用能力没有直接相关.
- 了解这些相互作用对于准确的生态建模至关重要.
研究的目的:
- 评估树种级VGC和LCE与生态系统级光合作用过程之间的相互作用.
- 分析VGC和LCE的持续时间,强度和驱动因素,以应对气候因素.
- 为了研究树环生长与树冠状况的潜在脱.
主要方法:
- 使用了三种树种 (Castanopsis eyrei,Castanea henryi,Liquidambar formosana) 的树环宽度 (TRW) 数据.
- 采用了基于卫星的增强植被指数 (EVI),叶面积指数 (LAI) 和总初级生产率 (GPP) 的数据.
- 应用了矢量自回归模型,冲动响应函数和预测错误差异分解.
主要成果:
- 在TRW中树种VGC水平在第一年最强,在第四年下降.
- 观察到特定物种的模式:与散射多孔物种 (Castanopsis eyrei,Castananea henryi) 相比,液态形 (环孔) 显示出更强的VGC和较弱的LCE.
- 在生态系统规模上,VGC和LCE对光合作用能力 (EVI,LAI,GPP) 的影响发生在96天内.
结论:
- 植被生长转移 (VGC) 在植被功能和生产力方面发挥着主导作用.
- 植被对先前生长状态的反应与气候变异性脱而出.
- 在多个指标和尺度上调查VGC和LCE可以提高全球变化模型的准确性.
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